[melted] / src / modules / dv / producer_libdv.c

/*
 * producer_libdv.c -- simple libdv test case
 * Copyright (C) 2003-2004 Ushodaya Enterprises Limited
 * Author: Charles Yates <charles.yates@pandora.be>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
 */

#include "producer_libdv.h"
#include <framework/mlt_frame.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <libdv/dv.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

typedef struct producer_libdv_s *producer_libdv;

struct producer_libdv_s
{
        struct mlt_producer_s parent;
        int fd;
        dv_decoder_t *dv_decoder;
        int is_pal;
        uint64_t file_size;
        int frame_size;
        long frames_in_file;
};

static int producer_get_frame( mlt_producer parent, mlt_frame_ptr frame, int index );
static void producer_close( mlt_producer parent );

static int producer_collect_info( producer_libdv this );

mlt_producer producer_libdv_init( char *filename )
{
        producer_libdv this = calloc( sizeof( struct producer_libdv_s ), 1 );

        if ( filename != NULL && this != NULL && mlt_producer_init( &this->parent, this ) == 0 )
        {
                mlt_producer producer = &this->parent;
                mlt_properties properties = mlt_producer_properties( producer );

                // Register transport implementation with the producer
                producer->close = producer_close;

                // Register our get_frame implementation with the producer
                producer->get_frame = producer_get_frame;

                // Create the dv_decoder
                this->dv_decoder = dv_decoder_new( FALSE, FALSE, FALSE );
                this->dv_decoder->quality = DV_QUALITY_BEST;
                this->dv_decoder->audio->arg_audio_emphasis = 2;
                dv_set_audio_correction( this->dv_decoder, DV_AUDIO_CORRECT_AVERAGE );

                // Open the file if specified
                this->fd = open( filename, O_RDONLY );
                producer_collect_info( this );

                // Set the resource property (required for all producers)
                mlt_properties_set( properties, "resource", filename );

                // Return the producer
                return producer;
        }
        free( this );
        return NULL;
}

static int read_frame( int fd, uint8_t* frame_buf, int *isPAL )
{
        int result = read( fd, frame_buf, frame_size_525_60 ) == frame_size_525_60;
        if ( result )
        {
                *isPAL = ( frame_buf[3] & 0x80 );

                if ( *isPAL )
                {
                        int diff = frame_size_625_50 - frame_size_525_60;
                        result = read( fd, frame_buf + frame_size_525_60, diff ) == diff;
                }
        }
        
        return result;
}

static int producer_collect_info( producer_libdv this )
{
        int valid = 0;
        uint8_t *dv_data = malloc( frame_size_625_50 );

        if ( dv_data != NULL )
        {
                // Read the first frame
                valid = read_frame( this->fd, dv_data, &this->is_pal );

                // If it looks like a valid frame, the get stats
                if ( valid )
                {
                        // Get the properties
                        mlt_properties properties = mlt_producer_properties( &this->parent );

                        // Determine the file size
                        struct stat buf;
                        fstat( this->fd, &buf );

                        // Store the file size
                        this->file_size = buf.st_size;

                        // Determine the frame size
                        this->frame_size = this->is_pal ? frame_size_625_50 : frame_size_525_60;

                        // Determine the number of frames in the file
                        this->frames_in_file = this->file_size / this->frame_size;

                        // Calculate default in/out points
                        double fps = this->is_pal ? 25 : 30000 / 1001;
                        mlt_timecode length = ( mlt_timecode )( this->frames_in_file ) / fps;
                        mlt_properties_set_double( properties, "fps", fps );
                        mlt_properties_set_timecode( properties, "length", length );
                        mlt_properties_set_timecode( properties, "in", 0.0 );
                        mlt_properties_set_timecode( properties, "out", length );

                        // Set the speed to normal
                        mlt_properties_set_double( properties, "speed", 1 );
                }

                free( dv_data );
        }

        return valid;
}

static int producer_get_image( mlt_frame this, uint8_t **buffer, mlt_image_format *format, int *width, int *height, int writable )
{
        int pitches[3] = { 0, 0, 0 };
        uint8_t *pixels[3] = { NULL, NULL, NULL };
        
        // Get the frames properties
        mlt_properties properties = mlt_frame_properties( this );

        // Get the dv decoder
        dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );

        // Get the dv data
        uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );

        // Assign width and height from properties
        *width = mlt_properties_get_int( properties, "width" );
        *height = mlt_properties_get_int( properties, "height" );

        // Extract an image of the format requested
        if ( *format == mlt_image_yuv422 )
        {
                // Allocate an image
                uint8_t *image = malloc( *width * *height * 2 );

                // Pass to properties for clean up
                mlt_properties_set_data( properties, "image", image, *width * *height * 2, free, NULL );

                // Decode the image
                pitches[ 0 ] = *width * 2;
                pixels[ 0 ] = image;
                dv_decode_full_frame( decoder, dv_data, e_dv_color_yuv, pixels, pitches );

                // Assign result
                *buffer = image;
        }
        else if ( *format == mlt_image_rgb24 )
        {
                // Allocate an image
                uint8_t *image = malloc( *width * *height * 3 );

                // Pass to properties for clean up
                mlt_properties_set_data( properties, "image", image, *width * *height * 3, free, NULL );

                // Decode the frame
                pitches[ 0 ] = 720 * 3;
                pixels[ 0 ] = image;
                dv_decode_full_frame( decoder, dv_data, e_dv_color_rgb, pixels, pitches );

                // Assign result
                *buffer = image;
        }

        return 0;
}

static int producer_get_audio( mlt_frame this, int16_t **buffer, mlt_audio_format *format, int *frequency, int *channels, int *samples )
{
        int16_t *p;
        int i, j;
        int16_t *audio_channels[ 4 ];
        
        // Get the frames properties
        mlt_properties properties = mlt_frame_properties( this );

        // Get the dv decoder
        dv_decoder_t *decoder = mlt_properties_get_data( properties, "dv_decoder", NULL );

        // Get the dv data
        uint8_t *dv_data = mlt_properties_get_data( properties, "dv_data", NULL );

        // Obtain required values
        *frequency = decoder->audio->frequency;
        *samples = decoder->audio->samples_this_frame;
        *channels = decoder->audio->num_channels;

        // Create a temporary workspace
        for ( i = 0; i < 4; i++ )
                audio_channels[ i ] = malloc( DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );

        // Create a workspace for the result
        *buffer = malloc( *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ) );

        // Pass the allocated audio buffer as a property
        mlt_properties_set_data( properties, "audio", *buffer, *channels * DV_AUDIO_MAX_SAMPLES * sizeof( int16_t ), free, NULL );

        // Decode the audio
        dv_decode_full_audio( decoder, dv_data, audio_channels );
        
        // Interleave the audio
        p = *buffer;
        for ( i = 0; i < *samples; i++ )
                for ( j = 0; j < *channels; j++ )
                        *p++ = audio_channels[ j ][ i ];

        // Free the temporary work space
        for ( i = 0; i < 4; i++ )
                free( audio_channels[ i ] );

        return 0;
}

static int producer_get_frame( mlt_producer producer, mlt_frame_ptr frame, int index )
{
        producer_libdv this = producer->child;
        uint8_t *data = malloc( frame_size_625_50 );
        
        // Obtain the current frame number
        uint64_t position = mlt_producer_frame( producer );
        
        // Convert timecode to a file position (ensuring that we're on a frame boundary)
        uint64_t offset = position * this->frame_size;

        // Create an empty frame
        *frame = mlt_frame_init( );

        // Seek and fetch
        if ( this->fd != 0 && 
                 lseek( this->fd, offset, SEEK_SET ) == offset &&
                 read_frame( this->fd, data, &this->is_pal ) )
        {
                // Get the frames properties
                mlt_properties properties = mlt_frame_properties( *frame );

                // Pass the dv decoder
                mlt_properties_set_data( properties, "dv_decoder", this->dv_decoder, 0, NULL, NULL );

                // Pass the dv data
                mlt_properties_set_data( properties, "dv_data", data, frame_size_625_50, free, NULL );

                // Update other info on the frame
                mlt_properties_set_int( properties, "width", 720 );
                mlt_properties_set_int( properties, "height", this->is_pal ? 576 : 480 );
                mlt_properties_set_int( properties, "top_field_first", 0 );
                
                // Parse the header for meta info
                dv_parse_header( this->dv_decoder, data );
                mlt_properties_set_int( properties, "progressive", dv_is_progressive( this->dv_decoder ) );
                mlt_properties_set_double( properties, "display_aspect", dv_format_wide( this->dv_decoder ) ? 16.0/9.0 : 4.0/3.0 );

                // Hmm - register audio callback
                ( *frame )->get_audio = producer_get_audio;
                
                // Push the get_image method on to the stack
                mlt_frame_push_get_image( *frame, producer_get_image );
        }
        else
        {
                free( data );
        }

        // Update timecode on the frame we're creating
        mlt_frame_set_timecode( *frame, mlt_producer_position( producer ) );

        // Calculate the next timecode
        mlt_producer_prepare_next( producer );

        return 0;
}

static void producer_close( mlt_producer parent )
{
        // Obtain this
        producer_libdv this = parent->child;

        // Free the dv deconder
        dv_decoder_free( this->dv_decoder );

        // Close the file
        if ( this->fd != 0 )
                close( this->fd );

        // Close the parent
        parent->close = NULL;
        mlt_producer_close( parent );

        // Free the memory
        free( this );
}